Which mathematical technique revolutionized retail recommendation systems and is credited with increasing Amazon's sales by an estimated 35% when first implemented?

In the world of retail, advanced mathematical models have transformed how companies analyze customer behavior and optimize inventory. One particular mathematical innovation has become the gold standard for recommendation systems used by major online retailers. These systems analyze vast amounts of data to predict customer preferences and drive sales through personalized suggestions. Test your knowledge about this intersection of mathematics and retail technology!

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Collaborative filtering using matrix factorization
Bayesian probability networks
Monte Carlo simulation algorithms
Convolutional neural networks